Standard fire testing of chimney linings from composite materials

Fire classification and requirements do not keep up with the development of plastics and composites, so we make a proposal for a realistic classification. Accompanied by the results of the oxygen index test, we have given the parameter that expresses the best the non-flammability of composites. Incineration in an oxygen-rich environment reveals potentially hidden flammability characteristics, which standard tests cannot detect. The requirements of fire standards mandatory for building materials [2] do not change even if the composites are tested in their actual size.